map

utility

Transforms array elements

Syntax

map(array, field|template)

array (array)

The array to transform (implicit when used in pipeline)

field (expression)

Field name or transformation expression

array

Transformed array

Extract names

Input:

map(.name)

Output:

["Alice", "Bob", "Charlie"]

Keep specific fields

Input:

map({name, age})

Output:

[{name: "Alice", age: 30}, {name: "Bob", age: 25}]

Double all values

Input:

map(. * 2)

Output:

[2, 4, 6, 8]

The map() function transforms each element in an array using a specified expression or template.

Use map() to extract fields, transform data, or apply operations to every element in an array or DataFrame.